Small Diameter Film Cooling Holes: Wall Convective Heat Transfer

[+] Author and Article Information
G. E. Andrews, M. Alikhanizadeh, A. A. Asere, C. I. Hussain, M. S. Khoshkbar Azari, M. C. Mkpadi

Department of Fuel and Energy, University of Leeds, Leeds, LS2.9JT, United Kingdom

J. Turbomach 108(2), 283-289 (Oct 01, 1986) (7 pages) doi:10.1115/1.3262049 History: Received February 14, 1986; Online November 09, 2009


The wall heat transfer resulting from small diameter holes drilled at 90 deg through gas turbine combustion chamber and turbine blade walls is considered. Available information is briefly reviewed and shown to generally omit the hole approach surface heat transfer and to relate only to the internal hole heat transfer. Experimental techniques are described for the determination of the overall heat transfer in a metal plate with a large number of coolant holes drilled at 90 deg. The results are compared with conventional short-tube internal heat transfer measurements and shown to involve much higher heat transfer rates and this mainly resulted from the additional hole approach flow heat transfer.

Copyright © 1986 by ASME
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